Hopping conductivity spectroscopy of carbon nanocluster materials

被引：1

作者：

Demishev, S. V. ^{[1
]}

Bozhko, A. D. ^{[1
]}

Glushkov, V. V. ^{[1
]}

Lyapin, A. G. ^{[2
]}

Obraztsova, E. D. ^{[1
]}

Pronin, A. A. ^{[1
]}

Ishchenko, T. V. ^{[1
]}

Samarin, N. A. ^{[1
]}

Sluchanko, N. E. ^{[1
]}

机构：

[1] RAS, AM Prokhorov Gen Phys Inst, Moscow 119991, Russia

[2] RAS, Inst High Pressure Phys, Troitsk, Moscow Region, Russia

来源：

FULLERENES NANOTUBES AND CARBON NANOSTRUCTURES | 2008年 / 16卷 / 5-6期

关键词：

hopping conductivity; magnetoresistance; spin effects; nanomaterials;

D O I：

10.1080/15363830802282151

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Procedure of the hopping conductivity rho similar to exp[(T-0/T)(alpha)] and magnetoresistance data analysis, which takes into account spin-polarization contribution and allows finding correct parameters of the localized states, is suggested. This general approach was checked for the nanocluster material synthesized under high (up to 8GPa) pressure of carbon SWNT mat containing 5% Ni. Experiments for the temperature/field domain 1.8-300K/70kOe have confirmed theoretical results, including universal magnetoresistance scaling ln[rho(H)/rho(0)]=(T-0/T)(alpha) F(H/T). It is found that the interaction with magnetic impurities renormalizes the electron magnetic moment: mu approximate to 0.7 mu(B). In conclusion, a possible way of creation of the carbon nanocluster material with colossal magnetoresistance is suggested.

引用

页码：445 / 453

页数：9

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